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        ELECTROCHEMICAL SYNTHESIS AND CHARACTERIZATION OF DIFFERENT MORPHOLOGIES NANORAMSDELLITE-MnO2

        MADJID TORKAMAN,AZIZAN AZIZ,MOHAMAD ABU BAKAR,SULAIMAN AB GHANI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.4

        In this work manganese dioxide (Ramsdellite-MnO2) was synthesized at room temperature using a facile electrochemical method. X-ray di®raction (XRD) was used to identify the type and the size of the crystal particle, while ¯eld emission scanning electron microscopy (FESEM) and energy ¯ltered transmission electron microscopy (EFTEM) were used to show and identify the morphology of the particles and changes of their morphologies with the increase of reaction times. Fourier transform infrared (FTIR) spectroscopy con¯rmed the Mn?O bond. Results from XRD showed that optimum time for synthesis Ramsdellite-MnO2 was 9 h. The results of EFTEM showed a mixture of nanospheres and nanorods after 9 h reaction time while a homogenous morphology of nanospheres was detected at 12 h reaction time. Results con¯rmed on the existence of a correlation between the reaction time and the resulting nanostructures. Moreover, the EFTEM result showed that average particle size for 12 h was (25 ? 7nm). The variation of calculated speci¯c capacitance (F/g) versus the di®erent scan rate has indicated that the e±-ciency of synthesized Ramsdellite-MnO2 nanostructures in 12 h reaction time was superior to 9 h.

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